Component Inspection

Inspection Condition	Inspection Procedure	Reference
Ignition "ON".	Connect KDS to Data Link Connector (DLC). Ignition "ON". Disconnect unit connector that connected to CAN communication circuit one after the other. Check for control unit causing the fault by communicating systems with KDS. Does KDS able to communicate with any of systems when one unit connector is disconnected?	-

Good

Fault might be intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and control module memory is not cleared yet. Thoroughly check terminal of battery, all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or damage.
Repair or replace as necessary and go to "Verification of Repair " procedure.

No Good

Carefully re-do this troubleshooting guide steps.
If problem still occurs, replace control unit that causing the fault and then go to "Verification of Repair " procedure.